John can't you do that with a feature in ssh called Deny users and specify the user name or that wouldnt work in a cluster environment.
I must admit that I am not running this in the context of an MPI style cluster. I am configuring nodes for interactive logins using the batch system to allocate the login sessions (interactive jobs) The contents of this e-mail are confidential and for the exclusive use of the intended recipient. If you are not the intended recipient you should not read, copy, retransmit or disclose its contents. If you have received this email in error please delete it from your system immediately and notify us either by email or telephone. The views expressed in this communication may not necessarily be the views held by McLaren Racing Limited. McLaren Racing Limited | McLaren Technology Centre | Chertsey Road | Woking | Surrey | GU21 4YH | UK | Company Number: 01517478
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